Re: How to shut ridge vents for power vent
The only problem with elminating the ridge vents is that you'll lose most of your passive ventilation which helps with moisture issues the other 9 months out of the year.
The other question is, do you have adequate soffit vents. Roof vents are useless wihtout soffit vents to supply cool air into the attic.
This is why I chose ot instead of cut holes in my 90 y/o soffits and roof (it had no venting) I spray foamed the underside of the roof deck for about 30% more than adding ridge vents and soffit vents would have cost. The result, my attic never gets above 90F even when it's 96 outside and sun beating down on the roof. Before about 1PM, it's within 5F of hte inside house temperature. Actually in hte morning it's sometimes cooler than it is inside the house. I actually need ot remove the existing attic insulation in the floor so the temps are more even in the winter.
1925 Two-Story Stucco Beaux Arts Neoclassical